Cross-staff ties displayed on wrong staff if also crossing system break
As shown below, the ties should belong to the part in the bottom staff, which has been move to the upper staff as a Cross-staff notation. In version 2.x, it was all good. However, since the 3.0 and latest version (126.96.36.19956) has released, this issue appears and hasn't been solved, yet. I hope the developers could attach importance to this bug.
The developers have fixed the Slur bug instead of the Tie bug.